(a) Show that the set of all positive rational no.'s is a countably i…
Previous year question for Discrete Mathematics.
Question
(a) Show that the set of all positive rational no.'s is a countably infinite set.
(b) Show that the function $f: \mathbb{R} \to \mathbb{R}$ define by $f(x) = 2x^3 + 1$, $\forall x \in \mathbb{R}$ is a bijection.
(c) Determine the no. of integers between 1 and 250 which are divisible by any of the integers 2, 3, 5, 7.
- Year: 2018
- Subject: Discrete Mathematics
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